Patent GB-165866-A (GB)
Title: Improvements in and connected with shift-mechanism for typewriters and like machines
IPC: B41J1/14
Filed: 1919-03-03
Abstract: 165,866. Harrington, F. C. A. March 3, 1919. No Patent granted (Sealing fee not paid). Carriage - shift mechanism; shift. keu actions. - In machines h av i n g a shift - carriage mounted on rods, the rods are supported by sleeves attached to the base of the machine, and shift - key mechanism is provided for moving the shift carriage in either direction on the rods. In the arrangement shown in Fig. 1, the rods j are supported by sleeves j<2> which are attached to supports j<1> on the base k. The shift carriage a is supported on the rods by means of rollers h which are mounted in brackets l<1> having hooked parts l engaging the rods. The shift carriage is formed with ears b engaging a rod c, carried at each end by a T lever d which is provided with a pin g engaging a slot f<1> in guide plates f. Shift-key levers e are pivoted to the T lever, and on depressing either shift-key lever, the T lever rocks upon the other shift-key lever. The shift- Margin stops.-The platen roller 65 is associated with the device described in Specification 165,867 and comprising a spring-actuated bar 56 co-operating with lugs 58 on the platen roller, for preventing the platen roller from rotating when the bottom edge of the sheet is approaching the printing line. Pad inking-arrangements; ink-ribbon mechanism. -The types rest on an ink pad 21 detachably mounted in a tray 77 which is supported at the ends and middle by lugs 20 and a bracket 76 on the base-plate. The ink-ribbon device 40 for occasional use described in Specification 165,872 may be pivoted on the arms 38 on the shift carriage 25. Sound-deadening supports.-The base plate 10 is provided at the bottom with a lining 85 of rubber, felt or the like which is retained by a plate 86 having lugs for attachment to the flanges 12 on the base-plate. A lining may be applied also to the top of the base-plate. Receptacles for pencils and accessories. - The base-plate 10 may be fitted with one or more drawers 88 for holding paper, carbons, pencils, &c. The runners 89 for the drawers are mounted on the inturned edges 90 of the flanges 12 on the base-plate. kev levers are returned to the normal position by springs. In the mechanism shown in Fig. 3, the shift-key levers e operate bell-cranks d<1> having arms d adapted to engage a block m on the shift carriage a, the movements being limited by the engagement of the block with stops n, or, in a modification, with the end n<1> of the inoperative bell-crank. The shift carriage is locked in the normal position by means of a lever o which is formed with a depending part o<2> for engaging projections p, or adjustable studs, on the bell-cranks. The lever can rock on the pivot g of the bellcranks and is formed with a slot o<1> engaging a pin m<1> on the shift carriage. The sides m<2> of the block m and the parts o<2>, p may be provided with cushions. The mechanism shown in Fig. 3 may be duplicated. According to one Provisional Specification the carriage may be shifted by a push-and-pull key which is locked in the normal or shift positions by a detent; or a rotatable cam, or a part having an inclined groove, which engages the carriage may be operated by a turn-button provided with a detent, or by one or more keys.